package com.newcoder.community.serverce;

import com.newcoder.community.utill.RedisKeyUtill;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.dao.DataAccessException;
import org.springframework.data.redis.core.RedisOperations;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.SessionCallback;
import org.springframework.stereotype.Service;

@Service
public class LikeService {
    @Autowired
    private RedisTemplate redisTemplate;
    //点赞
    public void like(int userId,int entityType,int entityId,int entityUserId ){
        redisTemplate.execute(new SessionCallback() {
            @Override
            public Object execute(RedisOperations redisOperations) throws DataAccessException {
                //点赞
                String entityLikeKey = RedisKeyUtill.getEntityLikeKEY(entityType,entityId);
                //被点赞
                String userLikeKey = RedisKeyUtill.getUserLikeKey(entityUserId);
                boolean isMember = redisTemplate.opsForSet().isMember(entityLikeKey, userId);
                redisOperations.multi();
                if(isMember){
                    redisTemplate.opsForSet().remove(entityLikeKey,userId);
                    redisTemplate.opsForValue().decrement(userLikeKey);
                }else {
                    redisTemplate.opsForSet().add(entityLikeKey,userId);
                    redisTemplate.opsForValue().increment(userLikeKey);
                }
                return redisOperations.exec();
            }
        });
    }
//查询某实体点赞数量
    public long findEntityLikeCount(int entityType,int entityId){
        String entityLikeKey = RedisKeyUtill.getEntityLikeKEY(entityType,entityId);
        return redisTemplate.opsForSet().size(entityLikeKey);
    }

    //查询某人对某实体的点赞状态
    public  int findEntityLikeStatus(int userId,int entityType,int entityId){
        String entityLikeKey = RedisKeyUtill.getEntityLikeKEY(entityType,entityId);
        return  redisTemplate.opsForSet().isMember(entityLikeKey,userId) ? 1 : 0;

    }
    //查询某个用户所有的赞
    public  int findUserLikeCount(int userId){
        String userLikeKey = RedisKeyUtill.getUserLikeKey(userId);
       Integer count = (Integer)redisTemplate.opsForValue().get(userLikeKey);
       return count==null? 0 : count.intValue();
    }
}
